CN219367628U - Liquid ammonia-auxiliary fuel combustion system - Google Patents

Abstract

The utility model discloses a liquid ammonia-auxiliary fuel combustion system, which is characterized in that an auxiliary fuel input port of a first conveying pipe of a combustor body is communicated with an auxiliary fuel conveying component, a first air input port is communicated with an air conveying component, the auxiliary fuel conveying component is used for conveying auxiliary fuel to a combustion chamber, and the air conveying component is used for conveying air to the combustion chamber; one end of the second conveying pipe is communicated with the liquid ammonia conveying assembly, the other end of the second conveying pipe is communicated with the atomizer, and the atomizer is positioned at the opening and is communicated with the opening; the cyclones are sequentially stacked in the height direction of the burner body and distributed at the opening, are sequentially communicated, and sequentially increase in input holes from one end of the opening far away from the combustion chamber to one end of the opening close to the combustion chamber. The combustion performance of the liquid ammonia-auxiliary fuel combustion system is improved, and the combustion stability of the liquid ammonia-auxiliary fuel combustion system is improved.

Description

Liquid ammonia-auxiliary fuel combustion system

Technical Field

The utility model relates to the technical field of industrial combustion systems, in particular to a liquid ammonia-auxiliary fuel combustion system.

Background

Liquid ammonia combustion can reduce the cost and volume of gas-fueled combustion devices. However, since the flame stability of liquid ammonia is defective, for example, the flame speed of the liquid ammonia-air mixture is low, a low inlet speed is required for the liquid ammonia in order to have a sufficient residence time in the burner, so that the mixing quality and efficiency of the liquid ammonia, air and hot products are suppressed, resulting in a low combustion efficiency of the liquid ammonia. Therefore, the prior art generally mixes and adds methane or hydrogen and the like into ammonia fuel, can effectively improve the combustibility and flame speed of the liquid ammonia fuel-air mixture, can improve the stability of flame, and compared with the combustion of pure hydrocarbon, the CO discharged by the mixed combustion of the ammonia fuel and hydrocarbon and the like ₂ Is lower.

However, in the prior art, a combustion system in which methane, hydrogen or the like is mixed and added into ammonia fuel is adopted, and the uniformity of the burner for mixing the ammonia fuel, air, methane, hydrogen or the like is poor, so that the combustion performance of the combustion system is poor, and the combustion stability is also poor.

Disclosure of Invention

The utility model aims to provide a liquid ammonia-auxiliary fuel combustion system, which aims to solve the problems that in the prior art, a combustion system which is formed by mixing and adding methane or hydrogen and the like into ammonia fuel is adopted, and the combustion system has poor combustion performance and poor combustion stability due to poor mixing uniformity of the combustor to the ammonia fuel, air, the methane or the hydrogen and the like.

To achieve the purpose, the utility model adopts the following technical scheme:

a liquid ammonia-auxiliary fuel combustion system comprising an auxiliary fuel delivery assembly, a liquid ammonia delivery assembly, an air delivery assembly, and a burner, the burner comprising:

the burner comprises a burner body, a burner cavity, an igniter, a first conveying pipe and a second conveying pipe, wherein the burner cavity is communicated with the opening, the first conveying pipe is communicated with the opening, the second conveying pipe is partially penetrated through the first conveying pipe, the first conveying pipe is provided with an auxiliary fuel input port and a first air input port, the auxiliary fuel input port is communicated with an auxiliary fuel conveying assembly, the first air input port is communicated with the air conveying assembly, the auxiliary fuel conveying assembly is used for conveying auxiliary fuel to the burner cavity, and the air conveying assembly is used for conveying air to the burner cavity;

one end of the second conveying pipe is communicated with the liquid ammonia conveying assembly, the other end of the second conveying pipe is communicated with the atomizer, and the atomizer is positioned at the opening and is communicated with the opening;

the cyclone group comprises a plurality of cyclones, the cyclones are sequentially stacked in the height direction of the burner body and are uniformly distributed at the opening, the cyclones are sequentially communicated, and the cyclones are sequentially increased from one end of the opening, which is far away from the combustion chamber, to one end of the opening, which is close to the combustion chamber, and the input holes of the cyclones are sequentially increased.

Preferably, the second delivery pipe comprises a straight pipe and an elbow pipe which are communicated, wherein the straight pipe is also communicated with the atomizer, and the elbow pipe is also communicated with the liquid ammonia delivery assembly;

the central axis of the burner body, the central axis of the opening, the central axis of the atomizer, the central axes of the cyclones, the central axis of the first conveying pipe and the central axis of the straight pipe are all collinear.

Preferably, along the height direction of the burner body, the atomizer, the cyclone group and the combustion chamber are sequentially arranged at intervals.

Preferably, the burner body is further provided with a plurality of second air input ports, the second air input ports are distributed at intervals along the circumferential direction of the burner body, and the opening and the second air input ports are respectively located at two ends of the burner body in the height direction.

Preferably, the cyclone comprises a cyclone shell and a plurality of cyclone blades uniformly and alternately arranged on the cyclone shell along the circumferential direction, the central area of the cyclone shell is provided with the input hole, and any two adjacent cyclone blades form a flow channel which is communicated with the input hole;

the height of the swirl blades of the swirler increases in sequence from one end of the opening away from the combustion chamber to one end of the opening close to the combustion chamber.

Preferably, the number of the cyclones is three, and the three cyclones are stacked in sequence along the height direction of the burner body, are arranged on the burner body in a stacked mode, and are distributed at the openings.

Preferably, the auxiliary fuel delivery assembly comprises an auxiliary fuel source, a first on-off valve, a first flow valve and a first one-way valve, wherein the auxiliary fuel source, the first on-off valve, the first flow valve and the first one-way valve are sequentially communicated through a first pipeline, and the first pipeline is also communicated with the auxiliary fuel input port.

Preferably, the liquid ammonia delivery assembly comprises a liquid ammonia source, a second switch valve, a filter, a second flow valve, a first buffer and a second one-way valve, wherein the liquid ammonia source, the second switch valve, the filter, the second flow valve, the first buffer and the second one-way valve are sequentially communicated through a second pipeline, and the second pipeline is also communicated with one end of the second delivery pipe.

Preferably, the air conveying assembly comprises an air compressor, a second buffer, a third switch valve, a flowmeter and a third one-way valve, wherein the air compressor, the second buffer, the third switch valve, the flowmeter and the third one-way valve are sequentially communicated through a third pipeline, and the third pipeline is further communicated with the first air input port.

Preferably, a temperature detecting device is arranged at the tail gas outlet of the burner body.

The utility model has the beneficial effects that:

the utility model aims to provide a liquid ammonia-auxiliary fuel combustion system, which comprises an auxiliary fuel conveying component, a liquid ammonia conveying component, an air conveying component and a combustor, wherein when the liquid ammonia-auxiliary fuel combustion system works, auxiliary fuel is firstly conveyed to a combustion chamber through the auxiliary fuel conveying component, air is conveyed to the combustion chamber through the air conveying component, a mixture of auxiliary fuel and air is ignited through an igniter, after the mixture of auxiliary fuel and air is combusted in the combustion chamber to be stable, liquid ammonia is conveyed to a second conveying pipe through the liquid ammonia conveying component, the liquid ammonia conveyed to the second conveying pipe atomizes the liquid ammonia under the action of an atomizer and is conveyed to an opening, and the auxiliary fuel, the air and the atomized liquid ammonia are mixed at the opening and conveyed to the combustion chamber to realize combustion release energy through the combustion system taking the liquid ammonia and the auxiliary fuel as fuel. The two ends of the second conveying pipe are respectively communicated with the atomizer and the liquid ammonia conveying assembly, and it can be understood that the atomizer can atomize the liquid ammonia, so that the liquid ammonia is well mixed with the auxiliary fuel and the air, the combustion performance of the liquid ammonia-auxiliary fuel combustion system is improved, and the combustion stability of the liquid ammonia-auxiliary fuel combustion system is improved; secondly, set up a plurality of swirlers at the opening part of combustor body, it can be understood that auxiliary fuel, air and the mixture of atomized liquid ammonia just can get into the combustion chamber after the swirler whirl, set up the input port of a plurality of swirlers and increase in proper order, a plurality of swirlers cooperation can be followed the circumference in combustion chamber with auxiliary fuel, air and the even diffusion of the mixture of atomized liquid ammonia in the combustion chamber to further promoted the combustion performance of liquid ammonia-auxiliary fuel combustion system, further promoted the combustion stability of liquid ammonia-auxiliary fuel combustion system.

Drawings

FIG. 1 is a schematic diagram of a liquid ammonia-assisted fuel combustion system provided in accordance with an embodiment of the present utility model;

FIG. 2 is a schematic view of a burner of a liquid ammonia-assisted fuel combustion system according to an embodiment of the present utility model;

FIG. 3 is a schematic view of a cyclone of a liquid ammonia-assisted fuel combustion system according to an embodiment of the present utility model, taken along a first view angle;

fig. 4 is a schematic structural view of a cyclone of a liquid ammonia-auxiliary fuel combustion system according to an embodiment of the present utility model along a second view angle.

In the figure:

1. an auxiliary fuel delivery assembly; 11. an auxiliary fuel source; 12. a first switching valve; 13. a first flow valve; 14. a first one-way valve; 15. a first pipeline;

2. a liquid ammonia delivery assembly; 21. a liquid ammonia source; 22. a second switching valve; 23. a filter; 24. a second flow valve; 25. a first buffer; 26. a second one-way valve; 27. a second pipeline;

3. an air delivery assembly; 31. an air compressor; 32. a fourth switching valve; 33. a second buffer; 34. a third switching valve; 35. a flow meter; 36. a third one-way valve; 37. a third pipeline;

4. a burner; 41. a burner body; 411. an opening; 412. a combustion chamber; 413. an igniter; 414. a first delivery tube; 4141. an auxiliary fuel input port; 4142. a first air inlet; 415. a second delivery tube; 4151. a straight pipe; 4152. bending the pipe; 416. a second air inlet; 42. an atomizer; 43. a cyclone; 431. a swirl housing; 4311. an input hole; 432. swirl vanes; 433. a flow passage;

5. and a temperature detecting device.

Detailed Description

The utility model is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the utility model and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present utility model are shown in the drawings.

In the description of the present utility model, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the utility model. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.

The present utility model provides a liquid ammonia-auxiliary fuel combustion system, as shown in fig. 1-4, comprising an auxiliary fuel delivery assembly 1, a liquid ammonia delivery assembly 2, an air delivery assembly 3 and a burner 4, the burner 4 comprising a burner body 41, an atomizer 42 and a cyclone group, the burner body 41 being provided with an opening 411, a combustion chamber 412 communicating with the opening 411, an igniter 413, a first delivery pipe 414 communicating with the opening 411, and a second delivery pipe 415 partially penetrating the first delivery pipe 414, the first delivery pipe 414 being provided with an auxiliary fuel inlet 4141 and a first air inlet 4142, the auxiliary fuel inlet 4141 communicating with the auxiliary fuel delivery assembly 1, the first air inlet 4142 communicating with the air delivery assembly 3, the auxiliary fuel delivery assembly 1 being for delivering auxiliary fuel to the combustion chamber 412, the air delivery assembly 3 being for delivering air to the combustion chamber 412; one end of the second delivery pipe 415 is communicated with the liquid ammonia delivery assembly 2, the other end is communicated with the atomizer 42, and the atomizer 42 is positioned at the opening 411 and is communicated with the opening 411; the cyclone group comprises a plurality of cyclones 43, the cyclones 43 are sequentially stacked on the burner body 41 along the height direction of the burner body 41 and are uniformly distributed at the opening 411, the cyclones 43 are sequentially communicated, and input holes 4311 of the cyclones 43 are sequentially increased from one end of the opening 411 away from the combustion chamber 412 to one end of the opening 411 close to the combustion chamber 412.

As shown in fig. 1 to 4, when the liquid ammonia-auxiliary fuel combustion system is operated, auxiliary fuel is firstly delivered to the combustion chamber 412 through the auxiliary fuel delivery assembly 1, air is delivered to the combustion chamber 412 through the air delivery assembly 3, a mixture of auxiliary fuel and air is ignited through the igniter 413, after the mixture of auxiliary fuel and air is stabilized in combustion in the combustion chamber 412, liquid ammonia is delivered to the second delivery pipe 415 through the liquid ammonia delivery assembly 2, the liquid ammonia delivered to the second delivery pipe 415 is atomized and delivered to the opening 411 under the action of the atomizer 42, and the auxiliary fuel, air and atomized liquid ammonia are mixed at the opening 411 and delivered to the combustion chamber 412 for combustion, so that combustion release energy through the combustion system using the liquid ammonia and the auxiliary fuel as fuel is realized. Wherein, by communicating the two ends of the second delivery pipe 415 with the atomizer 42 and the liquid ammonia delivery assembly 2, respectively, it can be understood that the atomizer 42 can atomize the liquid ammonia, so that the liquid ammonia is well mixed with the auxiliary fuel and the air, thereby improving the combustion performance of the liquid ammonia-auxiliary fuel combustion system and the combustion stability of the liquid ammonia-auxiliary fuel combustion system; secondly, a plurality of cyclones 43 are arranged at the opening 411 of the burner body 41, it can be understood that the mixture of the auxiliary fuel, air and atomized liquid ammonia enters the combustion chamber 412 after being swirled by the cyclones 43, the input holes 4311 of the cyclones 43 are sequentially increased, and the cyclones 43 are matched with the liquid ammonia-auxiliary fuel combustion system capable of uniformly dispersing the mixture of the auxiliary fuel, air and atomized liquid ammonia in the combustion chamber 412 along the circumferential direction of the combustion chamber 412, so that the combustion performance of the liquid ammonia-auxiliary fuel combustion system is further improved, and the combustion stability of the liquid ammonia-auxiliary fuel combustion system is further improved.

Specifically, when the liquid ammonia-auxiliary fuel combustion system stops operating, the liquid ammonia delivery assembly 2 is ended to deliver liquid ammonia, then the auxiliary fuel delivery assembly 1 is ended to deliver auxiliary fuel, and the air delivery assembly 3 is ended to deliver air. So configured, to avoid insufficient combustion of atomized liquid ammonia within the combustion chamber 412.

Specifically, in the present embodiment, the auxiliary fuel is exemplified as methane. In other embodiments, hydrogen, or a mixture of methane and hydrogen, or the like, may be selected as the auxiliary fuel.

The ab direction in fig. 2 is the height direction of the burner body 41. Fig. 3 is a top view of the cyclone 43.

Wherein, as shown in FIG. 2, second delivery tube 415 comprises a straight tube 4151 and an elbow tube 4152 in communication, straight tube 4151 also being in communication with atomizer 42, elbow tube 4152 also being in communication with liquid ammonia delivery assembly 2; the central axis of the burner body 41, the central axis of the opening 411, the central axis of the atomizer 42, the central axes of the plurality of swirlers 43, the central axis of the first conveying pipe 414, and the central axis of the straight pipe 4151 are all collinear. The central axis of the burner body 41, the central axis of the opening 411, the central axis of the atomizer 42, the central axes of the cyclones 43, the central axis of the first conveying pipe 414 and the central axis of the straight pipe 4151 are all collinear, it is understood that the inner peripheral wall of the first conveying pipe 414 and the outer peripheral wall of the straight pipe 4151 are distributed at intervals, the outer peripheral wall of the atomizer 42 and the inner peripheral wall of the opening 411 are distributed at intervals, the atomized liquid ammonia is circumferentially coated by the mixture of the auxiliary fuel and the air conveyed to the opening 411 by the first conveying pipe 414, and the atomized liquid ammonia output by the atomizer 42 has a certain impulse force, so that the auxiliary fuel, the air and the atomized liquid ammonia can be better mixed, the combustion performance of the liquid ammonia-auxiliary fuel combustion system is further improved, and the combustion stability of the liquid ammonia-auxiliary fuel combustion system is improved.

As shown in fig. 2, the atomizer 42, the cyclone group, and the combustion chamber 412 are sequentially disposed at intervals along the height direction of the burner body 41. The device is arranged so as to realize that atomized liquid ammonia, auxiliary fuel and air are mixed and then enter the cyclone 43, and then are conveyed into the combustion chamber 412 by the cyclone 43.

Specifically, in the present embodiment, the atomizers 42 are uniformly spaced apart with six nozzle openings in the circumferential direction.

As shown in fig. 2, the burner body 41 is further provided with a plurality of second air input ports 416, the plurality of second air input ports 416 are distributed at intervals along the circumferential direction of the burner body 41, and the opening 411 and the plurality of second air input ports 416 are respectively located at two ends of the burner body 41 in the height direction. Specifically, the plurality of second air input ports 416 are disposed on a side of the burner body 41 proximate to the outlet end. Through setting up a plurality of second air input ports 416 on the combustor body 41, when the temperature in the combustion chamber 412 is too high, carry the air to the combustion chamber 412 through second air input port 416 and air delivery module 3 in step, because the temperature of air is less than the temperature in the combustion chamber 412, so the air that is carried in the combustion chamber 412 by second air input port 416 can cool down to the combustion chamber 412, prevent the inside lining of combustor body 41 from being burnt out, can be used for promoting supplementary fuel and atomized liquid ammonia to fully burn again.

Specifically, as shown in fig. 3 and 4, the cyclone 43 includes a cyclone casing 431 and a plurality of cyclone blades 432 uniformly and intermittently disposed on the cyclone casing 431 along a circumferential direction, an input hole 4311 is provided in a central area of the cyclone casing 431, a flow channel 433 is formed by any two adjacent cyclone blades 432, and the flow channel 433 communicates with the input hole 4311; the height of the swirl vanes 432 of the swirler 43 increases in sequence from the end of the opening 411 that is remote from the combustion chamber 412 to the end of the opening 411 that is near the combustion chamber 412. It will be appreciated that for any adjacent swirler 43, the inlet 4311 of the swirler 43 proximate to the end of the combustion chamber 412 communicates with the flow passage 433 of the swirler 43 distal from the combustion chamber 412 from the end of the opening 411 distal from the combustion chamber 412 to the end of the opening 411 proximate to the combustion chamber 412. Specifically, a part of the mixture of the auxiliary fuel, air and atomized liquid ammonia flowing into the second input port 4311 flows into the flow channel 433, and the remaining part flows directly into the input port 4311 of the next cyclone 43 from the input port 4311, wherein a part of the mixture of the auxiliary fuel, air and atomized liquid ammonia flowing into the flow channel 433 of the next cyclone 43 flows into the flow channel 433 of the next cyclone 43, and the remaining part flows into the input port 4311 of the next cyclone 43, thus sequentially flowing through the plurality of cyclones 43, and finally flows into the combustion chamber 412 from the flow channel 433 of one cyclone 43 adjacent to the combustion chamber 412 and the input port 4311; next, the height of the swirl vanes 432 of the swirlers 43 is sequentially increased from the end of the opening 411 away from the combustion chamber 412 to the end of the opening 411 close to the combustion chamber 412 so that the space of the flow channels 433 is sequentially increased, and the flow channels 433 of the plurality of swirlers 43 cooperate to be able to adjust the amount of uniformly spreading out the mixture of the auxiliary fuel, air and atomized liquid ammonia in the combustion chamber 412 in the circumferential direction of the combustion chamber 412. Wherein the height direction of the swirl vanes 432 is parallel to the ab direction.

Specifically, in the present embodiment, the number of the swirlers 43 is three, and the three swirlers 43 are stacked in order in the height direction of the burner body 41 and are distributed at the opening 411 at the burner body 41. The mixture of the auxiliary fuel, air and atomized liquid ammonia can be uniformly spread out along the circumference of the combustion chamber 412.

1-4, the auxiliary fuel delivery assembly 1 includes an auxiliary fuel source 11, a first on-off valve 12, a first flow valve 13, and a first check valve 14, the auxiliary fuel source 11, the first on-off valve 12, the first flow valve 13, and the first check valve 14 are in communication in sequence through a first conduit 15, and the first conduit 15 is also in communication with an auxiliary fuel input port 4141. Specifically, the auxiliary fuel flows into the first delivery pipe 414 through the first switch valve 12, the first flow valve 13 and the first check valve 14 in sequence, flows into the opening 411 through the first delivery pipe 414 to be mixed with air and atomized liquid ammonia, and flows into the combustion chamber 412 through the cyclone 43; wherein the first non-return valve 14 is arranged to avoid damaging the auxiliary fuel source 11, the first on-off valve 12 and the first flow valve 13 when the burner 4 is tempered or even exploded. In this embodiment, the first switch valve 12 is an electromagnetic switch valve, and the liquid ammonia-auxiliary fuel combustion system further includes a controller, which is electrically connected to both the first switch valve 12 and the first flow valve 13. As an alternative, the first switching valve 12 is a manual switching valve.

As shown in fig. 1-4, the liquid ammonia delivery assembly 2 includes a liquid ammonia source 21, a second switch valve 22, a filter 23, a second flow valve 24, a first buffer 25, and a second check valve 26, wherein the liquid ammonia source 21, the second switch valve 22, the filter 23, the second flow valve 24, the first buffer 25, and the second check valve 26 are sequentially connected through a second pipe 27, and the second pipe 27 is further connected to one end of a second delivery pipe 415. Specifically, the liquid ammonia flows into the second delivery pipe 415 through the second switch valve 22, the filter 23, the second flow valve 24, the first buffer 25 and the second check valve 26 in sequence, flows into the atomizer 42 through the second delivery pipe 415, is mixed with air and auxiliary fuel after being ejected by the atomizer 42, and flows into the combustion chamber 412 through the cyclone 43; wherein, the second check valve 26 is arranged, so that the damage to the liquid ammonia source 21, the second switch valve 22, the filter 23, the second flow valve 24 and the first buffer 25 during the tempering or even explosion of the burner 4 can be avoided. In this embodiment, the second switch valve 22 is an electromagnetic switch valve, and the controller is further electrically connected to the second switch valve 22. As an alternative, the second on-off valve 22 is a manual on-off valve.

1-4, the air delivery assembly 3 includes an air compressor 31, a second buffer 33, a third switch valve 34, a flow meter 35, and a third check valve 36, where the air compressor 31, the second buffer 33, the third switch valve 34, the flow meter 35, and the third check valve 36 are sequentially communicated through a third pipe 37, and the third pipe 37 is also communicated with a first air input 4142. Specifically, air flows into the first delivery pipe 414 through the air compressor 31, the second buffer 33, the third switch valve 34, the flow meter 35 and the third check valve 36 in sequence, flows into the opening 411 through the first delivery pipe 414 to be mixed with auxiliary fuel and atomized liquid ammonia, and flows into the combustion chamber 412 through the cyclone 43; wherein the third check valve 36 is provided, the air compressor 31, the second buffer 33, the third switch valve 34 and the flow meter 35 can be prevented from being damaged when the burner 4 is tempered or even exploded. In the present embodiment, the third switching valve 34 is an electromagnetic switching valve, and the controller is electrically connected to the air compressor 31 and the third switching valve 34. As an alternative, the third switching valve 34 is a manual switching valve.

Preferably, an air filter is provided at the inlet of the air compressor 31. So arranged, to avoid the entry of airborne debris into the first duct 414 and/or the opening 411 and also to avoid the entry of debris into the combustion chamber 412.

Preferably, a fourth on-off valve 32 is further provided between the air compressor 31 and the second buffer 33. The fourth switching valve 32 is provided to facilitate the connection or disconnection of the air compressor 31 and the second buffer 33. In this embodiment, the fourth switching valve 32 is an electromagnetic switching valve, and the controller is electrically connected to the fourth switching valve 32. As an alternative, the fourth switching valve 32 is a manual switching valve.

As shown in fig. 1, a temperature detecting device 5 is disposed at the exhaust outlet of the burner body 41. The temperature detecting means 5 is for monitoring the temperature at the exhaust outlet of the burner body 41 in order to determine whether air is fed from the second air inlet 416 to the combustion chamber 412 based on the temperature monitored here. Specifically, in the present embodiment, a temperature sensor is exemplarily provided at the exhaust gas outlet of the burner body 41, and the temperature sensor is electrically connected to the controller.

It is to be understood that the above examples of the present utility model are provided for clarity of illustration only and are not limiting of the embodiments of the present utility model. Various obvious changes, rearrangements and substitutions can be made by those skilled in the art without departing from the scope of the utility model. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the utility model are desired to be protected by the following claims.

Claims (10)

1. Liquid ammonia-auxiliary fuel combustion system, characterized by, including auxiliary fuel delivery assembly (1), liquid ammonia delivery assembly (2), air delivery assembly (3) and combustor (4), combustor (4) include:

a burner body (41), the burner body (41) is provided with an opening (411), a combustion chamber (412) communicated with the opening (411), an igniter (413), a first conveying pipe (414) communicated with the opening (411), and a second conveying pipe (415) which is partially penetrated in the first conveying pipe (414), the first conveying pipe (414) is provided with an auxiliary fuel inlet (4141) and a first air inlet (4142), the auxiliary fuel inlet (4141) is communicated with the auxiliary fuel conveying assembly (1), the first air inlet (4142) is communicated with the air conveying assembly (3), the auxiliary fuel conveying assembly (1) is used for conveying auxiliary fuel to the combustion chamber (412), and the air conveying assembly (3) is used for conveying air to the combustion chamber (412);

an atomizer (42), one end of the second conveying pipe (415) is communicated with the liquid ammonia conveying assembly (2), the other end of the second conveying pipe is communicated with the atomizer (42), and the atomizer (42) is positioned at the opening (411) and is communicated with the opening (411);

the cyclone group comprises a plurality of cyclones (43), the cyclones (43) are sequentially stacked in the height direction of the burner body (41) and are uniformly distributed at the opening (411), the cyclones (43) are sequentially communicated, one end of the opening (411) away from the combustion chamber (412) is far away from one end of the opening (411) to one end of the opening (411) close to the combustion chamber (412), and the input holes (4311) of the cyclones (43) are sequentially increased.

2. The liquid ammonia-assisted fuel combustion system of claim 1, wherein the second delivery tube (415) comprises a straight tube (4151) and an elbow tube (4152) in communication, the straight tube (4151) further communicating with the atomizer (42), the elbow tube (4152) further communicating with the liquid ammonia delivery assembly (2);

the central axis of the burner body (41), the central axis of the opening (411), the central axis of the atomizer (42), the central axes of the plurality of cyclones (43), the central axis of the first conveying pipe (414), and the central axis of the straight pipe (4151) are all collinear.

3. Liquid ammonia-assisted fuel combustion system according to claim 1, characterized in that said atomizer (42), said swirler assembly and said combustion chamber (412) are arranged at intervals in succession along the height of said burner body (41).

4. The liquid ammonia-auxiliary fuel combustion system according to claim 1, wherein the burner body (41) is further provided with a plurality of second air input ports (416), the plurality of second air input ports (416) are spaced apart in a circumferential direction of the burner body (41), and the opening (411) and the plurality of second air input ports (416) are located at both ends in a height direction of the burner body (41), respectively.

5. The liquid ammonia-assisted fuel combustion system according to any one of claims 1-4, wherein said swirler (43) comprises a swirl housing (431) and a plurality of swirl vanes (432) arranged circumferentially uniformly and at intervals to said swirl housing (431), a central region of said swirl housing (431) being provided with said inlet aperture (4311), any adjacent two of said swirl vanes (432) forming a flow channel (433), said flow channel (433) being in communication with said inlet aperture (4311);

the height of the swirl vanes (432) of the swirler (43) increases in sequence from the end of the opening (411) away from the combustion chamber (412) to the end of the opening (411) close to the combustion chamber (412).

6. Liquid ammonia-assisted fuel combustion system according to any one of claims 1-4, characterized in that the number of cyclones (43) is three, three cyclones (43) being arranged stacked in sequence in the height direction of the burner body (41) at the burner body (41) and being distributed uniformly at the openings (411).

7. Liquid ammonia-auxiliary fuel combustion system according to any one of claims 1-4, characterized in that the auxiliary fuel delivery assembly (1) comprises an auxiliary fuel source (11), a first on-off valve (12), a first flow valve (13) and a first one-way valve (14), the auxiliary fuel source (11), the first on-off valve (12), the first flow valve (13) and the first one-way valve (14) being in turn connected by a first conduit (15), and the first conduit (15) being further connected with the auxiliary fuel inlet (4141).

8. The liquid ammonia-assisted fuel combustion system according to any one of claims 1-4, wherein the liquid ammonia delivery assembly (2) comprises a liquid ammonia source (21), a second on-off valve (22), a filter (23), a second flow valve (24), a first buffer (25) and a second one-way valve (26), wherein the liquid ammonia source (21), the second on-off valve (22), the filter (23), the second flow valve (24), the first buffer (25) and the second one-way valve (26) are in communication in sequence through a second conduit (27), and wherein the second conduit (27) is also in communication with one end of the second delivery tube (415).

9. Liquid ammonia-assisted fuel combustion system according to any one of claims 1-4, characterized in that the air delivery assembly (3) comprises an air compressor (31), a second buffer (33), a third switching valve (34), a flow meter (35) and a third non-return valve (36), the air compressor (31), the second buffer (33), the third switching valve (34), the flow meter (35) and the third non-return valve (36) being in turn connected by a third conduit (37), and the third conduit (37) being also in communication with the first air inlet (4142).

10. A liquid ammonia-assisted fuel combustion system according to any one of claims 1-4, characterized in that the burner body (41) is provided with temperature detection means (5) at the tail gas outlet.